Rugby is a great sport to watch live, and its tackling techniques have recently been adopted by some teams in the NFL, as they lead to less injuries. (though no one could call them gentle).
Scotland has Edinburgh Rugby:
and the Glasgow Warriors.
http://www.glasgowwarriors.org
London has the Harlequins and Saracens.
Check out Harlequins’ website here:
And the Saracens:
Book soon, as the matches sell out quickly.